I've not heard the experession "hole in the spine", nor a description of "significantly less brain fibers" used to describe MS. Is that his exact description? Do you by chance have a copy of your MRI? Maybe some language in there would be more descriptive. People with MS CAN have spinal lesions...just like brain lesions...and the spinal lesions can cause disability, usually from the point of the lesion, down. Like, I have spinal lesions that have caused my legs to no longer function well. But those are the same sort of lesions that appear in the brain, and I've not ever heard them described as "holes".
At any rate, the doctor's "orders" to you -- to wait and watch, wait and see -- are pretty typical. They'll tell you "come back in (some) months and we'll check again." What that generally REALLY means is this:
"If there are no changes in your situation, no new symptoms, no worsening of current symptoms, come back in six months and we'll check.
But if there ARE changes, if there ARE new symptoms, if there IS WORSENING of current symptoms, call, report all that, and we'll get you in sooner."
So you should be keeping a log of your symptoms..and note if they worsen, note if there is some pattern you can detect to their happening (like, if you get overheated, or overchilled, or overtired.) Note NEW symptoms, and if they remain, or come and go. Note the fatigue (pretty common in MS, and in other disorders) and if it worsens. And then call the doctor earlier than May if there is significant change.
I'm sorry you're stuck in the "wait and see" zone! Take care.
...I am not a doctor, nor health professional, and don't pretend to be one, here.....